Recently, [1]} proposed DRO-LT,
which adds the regulariser \(\Omega _{\rm dro}( x, y ) \stackrel{.}{=}\)
\(\log \left[ \sum _{(x^{\prime }, y^{\prime }) \in S} e^{-\Vert  \Phi ( x^{\prime } ) - \mu _y \Vert _2^2 + \Vert  \Phi ( x ) - \mu _y \Vert _2^2 + \epsilon _y \cdot \mathbb {I}( y^{\prime } \ne y )} \right],\) 
